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3.5.5 GSM PAM (U101 : SKY77318)
The SKY77318 is an extremely small (6 x 6 mm), GSM PAM for handset applications. This module
has been optimized for excellent efficiency and Pout while maintaining high GSM/GPRS efficiency.
The small size and high performance is achieved with high-reliability GaAs HBT technology.
With 50Ω and output, no external matching or bias components are required. The module incorporates
two highly-integrated GaAs power amplifier die with a BiCMOS controller.
Each amplifier has three gain stages with on-die inter-stage matching implemented with a high Q
passives technology for optimal performance. The CMOS controller implements a fully integrated
power control within the module for GSM operations, and serves as the GPRS operations. This
eliminates the need for any external couplers, power detectors, current sensing etc., to assure the
output power level. The module has Tx enable and band select inputs. Module construction is a low-
profile overmolded land-grid array on laminate.
3. TECHNICAL BRIEF
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[Figure 1. 8] GSM PAM Schematic
GSM_PA_BAND MODE
8.86dB
HIGH
Rev.D
EGSM
GSM
DCS/PCS
Rev.1.0
LOW
7.5dB
C136
0.01u
10nH
L116
L406 2.7nH
100p
C438
C124
100p
100ohm
R114
NA
5.6p
C441
1.5nH
L403
L115
18nH
100ohm
100ohmR113
R117
100ohm
R107
C153
15p
3
G2
5
G3
1
IN
4
O1
R11091
EFCH897MTDB1
FL101
2
G1
C123
0.01u
39
R112
L111
5.6nH
68p
C139C137
NA
C134
0.01u
GND3
9
GND4
10
GND5
GND6
12
GND7
13
GND8
14
GND9
16
21
P_GND
19
RSVD_GND
VAPC
20
17
VBATT
2
VCC1A
6
VCC1B
BS
1
DCS_PCS_IN
315
DCS_PCS_OUT
EGSM_IN
4
EGSM_OUT
11
ENABLE
18
GND1
5
GND2
7
8
SKY77318
U101
C149
15p
100ohm
R115
91 R111
C121
33u
C138
NA
R108
51
GSM_TX
DCS_PCS_TX
+VPWR
GSM_PA_BAND
GSM_PA_EN
GSM_PA_RA